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Constraints on radiative dark-matter decay from the cosmic microwave background
Zhang, Le; Chen, Xuelei; Kamionkowski, Marc; Si, Zong-guo; Zheng, Zheng
2007-09-01
Source PublicationPHYSICAL REVIEW D
Volume76Issue:6
AbstractIf dark matter decays to electromagnetically interacting particles, it can inject energy into the baryonic gas and thus affect the processes of recombination and reionization. This leaves an imprint on the cosmic microwave background (CMB): the large-scale polarization is enhanced, and the small-scale temperature fluctuation is damped. We use the Wilkinson Microwave Anisotropy Probe (WMAP) three-year data combined with galaxy surveys to constrain radiatively decaying dark matter. Our new limits to the dark-matter decay width are about 10 times stronger than previous limits. For dark-matter lifetimes that exceed the age of the Universe, a limit of zeta Gamma(chi)< 1.7x10(-25) s(-1) (95% C.L.) is derived, where zeta is the efficiency of converting decay energy into ionization energy. Limits for lifetimes short compared with the age of the Universe are also derived. We forecast improvements expected from the Planck satellite.
DOI10.1103/PhysRevD.76.061301
Indexed BySCI
Language英语
WOS IDWOS:000249786900002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7235
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Shandong Univ, Dept Phys, Jinan 250100, Peoples R China
3.CALTECH, Pasadena, CA 91125 USA
4.Inst Adv Study, Princeton, NJ 08540 USA
Recommended Citation
GB/T 7714
Zhang, Le,Chen, Xuelei,Kamionkowski, Marc,et al. Constraints on radiative dark-matter decay from the cosmic microwave background[J]. PHYSICAL REVIEW D,2007,76(6).
APA Zhang, Le,Chen, Xuelei,Kamionkowski, Marc,Si, Zong-guo,&Zheng, Zheng.(2007).Constraints on radiative dark-matter decay from the cosmic microwave background.PHYSICAL REVIEW D,76(6).
MLA Zhang, Le,et al."Constraints on radiative dark-matter decay from the cosmic microwave background".PHYSICAL REVIEW D 76.6(2007).
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